[compiler-rt][asan] Re-enable forkpty test on AArch64 (NFC) (llvm#127667)

Disabled in 86474c7, no longer failing
on AArch64 (for me at least).

Fixes: llvm#24774

Author: c-rhodes

compiler-rt/test/sanitizer_common/TestCases/Posix/getpass.cpp

@@ -3,7 +3,6 @@
 // Ignore leaks as this is not the point of test, but HWASAN repors one here.
 // RUN: %env_tool_opts=detect_leaks=0 %run %t | FileCheck %s
 
-// REQUIRES: stable-runtime
 // XFAIL: android && asan
 
 // No libutil.